Hi newbie here. I have a fiat 500 2012 with water noise in dash. 3 mechanics have looked at it and still the same. Heater is getting warm and not over heating. It's just been in garage to be tested for any leaks and NO there is none. I have tried bleeding it myself before it went in the garage and it is better than it was. No spill funnel I bought doesn't fit. Driving me nuts.